// Simple Set Clipboard System
// Author: Joseph Huckaby

var ZeroClipboard = {
  
  version: "1.0.7",
  clients: {}, // registered upload clients on page, indexed by id
  moviePath: 'ZeroClipboard.swf', // URL to movie
  nextId: 1, // ID of next movie
  
  $: function(thingy) {
    // simple DOM lookup utility function
    if (typeof(thingy) == 'string') thingy = document.getElementById(thingy);
    if (!thingy.addClass) {
      // extend element with a few useful methods
      thingy.hide = function() { this.style.display = 'none'; };
      thingy.show = function() { this.style.display = ''; };
      thingy.addClass = function(name) { this.removeClass(name); this.className += ' ' + name; };
      thingy.removeClass = function(name) {
        var classes = this.className.split(/\s+/);
        var idx = -1;
        for (var k = 0; k < classes.length; k++) {
          if (classes[k] == name) { idx = k; k = classes.length; }
        }
        if (idx > -1) {
          classes.splice( idx, 1 );
          this.className = classes.join(' ');
        }
        return this;
      };
      thingy.hasClass = function(name) {
        return !!this.className.match( new RegExp("\\s*" + name + "\\s*") );
      };
    }
    return thingy;
  },
  
  setMoviePath: function(path) {
    // set path to ZeroClipboard.swf
    this.moviePath = path;
  },
  
  dispatch: function(id, eventName, args) {
    // receive event from flash movie, send to client   
    var client = this.clients[id];
    if (client) {
      client.receiveEvent(eventName, args);
    }
  },
  
  register: function(id, client) {
    // register new client to receive events
    this.clients[id] = client;
  },
  
  getDOMObjectPosition: function(obj, stopObj) {
    // get absolute coordinates for dom element
    var info = {
      left: 0, 
      top: 0, 
      width: obj.width ? obj.width : obj.offsetWidth, 
      height: obj.height ? obj.height : obj.offsetHeight
    };

    while (obj && (obj != stopObj)) {
      info.left += obj.offsetLeft;
      info.top += obj.offsetTop;
      obj = obj.offsetParent;
    }

    return info;
  },
  
  Client: function(elem) {
    // constructor for new simple upload client
    this.handlers = {};
    
    // unique ID
    this.id = ZeroClipboard.nextId++;
    this.movieId = 'ZeroClipboardMovie_' + this.id;
    
    // register client with singleton to receive flash events
    ZeroClipboard.register(this.id, this);
    
    // create movie
    if (elem) this.glue(elem);
  }
};

ZeroClipboard.Client.prototype = {
  
  id: 0, // unique ID for us
  ready: false, // whether movie is ready to receive events or not
  movie: null, // reference to movie object
  clipText: '', // text to copy to clipboard
  handCursorEnabled: true, // whether to show hand cursor, or default pointer cursor
  cssEffects: true, // enable CSS mouse effects on dom container
  handlers: null, // user event handlers
  
  glue: function(elem, appendElem, stylesToAdd) {
    // glue to DOM element
    // elem can be ID or actual DOM element object
    this.domElement = ZeroClipboard.$(elem);
    
    // float just above object, or zIndex 99 if dom element isn't set
    var zIndex = 99;
    if (this.domElement.style.zIndex) {
      zIndex = parseInt(this.domElement.style.zIndex, 10) + 1;
    }
    
    if (typeof(appendElem) == 'string') {
      appendElem = ZeroClipboard.$(appendElem);
    }
    else if (typeof(appendElem) == 'undefined') {
      appendElem = document.getElementsByTagName('body')[0];
    }
    
    // find X/Y position of domElement
    var box = ZeroClipboard.getDOMObjectPosition(this.domElement, appendElem);
    
    // create floating DIV above element
    this.div = document.createElement('div');
    var style = this.div.style;
    style.position = 'absolute';
    style.left = '' + box.left + 'px';
    style.top = '' + box.top + 'px';
    style.width = '' + box.width + 'px';
    style.height = '' + box.height + 'px';
    style.zIndex = zIndex;
    
    if (typeof(stylesToAdd) == 'object') {
      for (addedStyle in stylesToAdd) {
        style[addedStyle] = stylesToAdd[addedStyle];
      }
    }
    
    // style.backgroundColor = '#f00'; // debug
    
    appendElem.appendChild(this.div);
    
    this.div.innerHTML = this.getHTML( box.width, box.height );
  },
  
  getHTML: function(width, height) {
    // return HTML for movie
    var html = '';
    var flashvars = 'id=' + this.id + 
      '&width=' + width + 
      '&height=' + height;
      
    if (navigator.userAgent.match(/MSIE/)) {
      // IE gets an OBJECT tag
      var protocol = location.href.match(/^https/i) ? 'https://' : 'http://';
      html += '<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="'+protocol+'download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" width="'+width+'" height="'+height+'" id="'+this.movieId+'" align="middle"><param name="allowScriptAccess" value="always" /><param name="allowFullScreen" value="false" /><param name="movie" value="'+ZeroClipboard.moviePath+'" /><param name="loop" value="false" /><param name="menu" value="false" /><param name="quality" value="best" /><param name="bgcolor" value="#ffffff" /><param name="flashvars" value="'+flashvars+'"/><param name="wmode" value="transparent"/></object>';
    }
    else {
      // all other browsers get an EMBED tag
      html += '<embed id="'+this.movieId+'" src="'+ZeroClipboard.moviePath+'" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="'+width+'" height="'+height+'" name="'+this.movieId+'" align="middle" allowScriptAccess="always" allowFullScreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="'+flashvars+'" wmode="transparent" />';
    }
    return html;
  },
  
  hide: function() {
    // temporarily hide floater offscreen
    if (this.div) {
      this.div.style.left = '-2000px';
    }
  },
  
  show: function() {
    // show ourselves after a call to hide()
    this.reposition();
  },
  
  destroy: function() {
    // destroy control and floater
    if (this.domElement && this.div) {
      this.hide();
      this.div.innerHTML = '';
      
      var body = document.getElementsByTagName('body')[0];
      try { body.removeChild( this.div ); } catch(e) {;}
      
      this.domElement = null;
      this.div = null;
    }
  },
  
  reposition: function(elem) {
    // reposition our floating div, optionally to new container
    // warning: container CANNOT change size, only position
    if (elem) {
      this.domElement = ZeroClipboard.$(elem);
      if (!this.domElement) this.hide();
    }
    
    if (this.domElement && this.div) {
      var box = ZeroClipboard.getDOMObjectPosition(this.domElement);
      var style = this.div.style;
      style.left = '' + box.left + 'px';
      style.top = '' + box.top + 'px';
    }
  },
  
  setText: function(newText) {
    // set text to be copied to clipboard
    this.clipText = newText;
    if (this.ready) this.movie.setText(newText);
  },
  
  addEventListener: function(eventName, func) {
    // add user event listener for event
    // event types: load, queueStart, fileStart, fileComplete, queueComplete, progress, error, cancel
    eventName = eventName.toString().toLowerCase().replace(/^on/, '');
    if (!this.handlers[eventName]) this.handlers[eventName] = [];
    this.handlers[eventName].push(func);
  },
  
  setHandCursor: function(enabled) {
    // enable hand cursor (true), or default arrow cursor (false)
    this.handCursorEnabled = enabled;
    if (this.ready) this.movie.setHandCursor(enabled);
  },
  
  setCSSEffects: function(enabled) {
    // enable or disable CSS effects on DOM container
    this.cssEffects = !!enabled;
  },
  
  receiveEvent: function(eventName, args) {
    // receive event from flash
    eventName = eventName.toString().toLowerCase().replace(/^on/, '');
        
    // special behavior for certain events
    switch (eventName) {
      case 'load':
        // movie claims it is ready, but in IE this isn't always the case...
        // bug fix: Cannot extend EMBED DOM elements in Firefox, must use traditional function
        this.movie = document.getElementById(this.movieId);
        if (!this.movie) {
          var self = this;
          setTimeout( function() { self.receiveEvent('load', null); }, 1 );
          return;
        }
        
        // firefox on pc needs a "kick" in order to set these in certain cases
        if (!this.ready && navigator.userAgent.match(/Firefox/) && navigator.userAgent.match(/Windows/)) {
          var self = this;
          setTimeout( function() { self.receiveEvent('load', null); }, 100 );
          this.ready = true;
          return;
        }
        
        this.ready = true;
        this.movie.setText( this.clipText );
        this.movie.setHandCursor( this.handCursorEnabled );
        break;
      
      case 'mouseover':
        if (this.domElement && this.cssEffects) {
          this.domElement.addClass('hover');
          if (this.recoverActive) this.domElement.addClass('active');
        }
        break;
      
      case 'mouseout':
        if (this.domElement && this.cssEffects) {
          this.recoverActive = false;
          if (this.domElement.hasClass('active')) {
            this.domElement.removeClass('active');
            this.recoverActive = true;
          }
          this.domElement.removeClass('hover');
        }
        break;
      
      case 'mousedown':
        if (this.domElement && this.cssEffects) {
          this.domElement.addClass('active');
        }
        break;
      
      case 'mouseup':
        if (this.domElement && this.cssEffects) {
          this.domElement.removeClass('active');
          this.recoverActive = false;
        }
        break;
    } // switch eventName
    
    if (this.handlers[eventName]) {
      for (var idx = 0, len = this.handlers[eventName].length; idx < len; idx++) {
        var func = this.handlers[eventName][idx];
      
        if (typeof(func) == 'function') {
          // actual function reference
          func(this, args);
        }
        else if ((typeof(func) == 'object') && (func.length == 2)) {
          // PHP style object + method, i.e. [myObject, 'myMethod']
          func[0][ func[1] ](this, args);
        }
        else if (typeof(func) == 'string') {
          // name of function
          window[func](this, args);
        }
      } // foreach event handler defined
    } // user defined handler for event
  }
  
};
